JP2557790B2 - High bending toughness PC pile cage assembly method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to a high toughness PC.
TECHNICAL FIELD The present invention relates to a method for assembling a reinforcing bar cage for a pile, which is composed of a spiral bar, a support bar for the spiral bar, and a tension bar, and has a high bending toughness.

[0002]

2. Description of the Related Art Conventionally, a PC pile, that is, a prestressed concrete pile in which a PC steel material is embedded in the vertical direction and a vertical prestress is applied to the whole, has been used. Further, in recent years, a high bending toughness PC pile having improved bending toughness by arranging spiral reinforcements (lateral restraint reinforcements) has been developed.

The spiral bar of the high bending toughness PC pile is preferably arranged near the surface of the PC pile away from the tension bar made of PC steel. Therefore, the present inventor spirals as shown in FIG. The supporting muscles 1 for supporting muscles are arranged in a cylindrical shape, and the spiral muscles 2 are fixed to the outside thereof to assemble them into a cylindrical cage shape.
The manufacturing of a PC pile in which the spiral bar 2 is arranged at a predetermined position by applying tension in the mold 3 has been developed (Japanese Patent Publication No. 5-17009).

[0004]

Such a conventional PC
In the manufacture of a pile, it is necessary to insert a tension muscle made of PC steel, which is the main muscle, into a cylindrical cage composed of the support muscles 1 and the spiral muscles 2, and the tension muscles 4 are tensioned to introduce prestress. It must be placed in parallel because it is a thing. Moreover, since there are ten to ten muscles and a large number of those having a thickness of about 7 to 14 mm, it takes a lot of labor and time if the inserting work and the positioning work of both ends of each tense are performed manually. There was a problem of cost.

In view of these problems, the present invention provides a method for assembling a cage for a high-bending toughness PC pile, in which the insertion and positioning of the tension muscles are qualified when assembling the reinforcing muscles including the spiral muscles. It was made for the purpose.

[0006]

The gist of the present invention for attaining the above-mentioned object is to provide a circular arrangement having a supporting muscle insertion hole for penetrating a supporting muscle for supporting a helical muscle and supporting the supporting muscle. A pair of front and rear end plates having concentrically arranged center-sides of the muscle insertion holes and having tension muscle insertion holes for penetrating the tension muscles made of PC steel are used, and the rear end side of the both end plates is used. While fixing the end plate to the fixed base side, the front end side end plate is fixed to the drawer device side, and the supporting muscles and the tense muscles are inserted into the respective holes of the rear end side end plate with the both end plates being close to each other,
While passing the tip through the front end side end plate to prevent it from coming off,
A spiral bar shaped like a coil spring is fitted on the outer peripheral side of the support bar passed through the both end plates, and then the front end side end plate is moved in a direction away from the fixed base by the drawer device, and the spiral bar After being stretched in the axial direction to be wound around the outer peripheral side of the support bar at a desired pitch,
A method of assembling a basket for a high bending toughness PC pile, characterized in that the spiral muscle and the supporting muscle are fixed.

[0007]

According to this method of assembling the basket for high bending toughness PC piles, the supporting muscles and the tension muscles are inserted through the both end plates, and the front end side end plates are moved to be guided by the both end plates to support the supporting muscles and the tension muscles. Are positioned in a concentric cylindrical arrangement. By stretching the spiral bar fitted outside the supporting bar to the required length of the supporting bar, the spiral bar expands to the pitch ratio when the pitch was preliminarily made into a coil spring due to the elasticity of the spiral bar to support it. It will be wrapped around the muscle. By fixing this at the crossing position with the supporting muscles with a binding machine, etc., a cage in which the tension muscles are inserted with both ends positioned by the both end plates in a cylindrical cage with end plates arranged at both ends. Is assembled. Both end plates can be used as end plates of the PC pile.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a state in which a basket assembled according to the present invention is housed in a mold, and concrete is cast and centrifugally molded. In FIG. 1, 10 is a cylindrical mold and 11 is a mold. Concrete, 12a and 12b are end plates, 13
Is a hakama fitting fixed to the end plates 12a and 12b. The basket is
Tensile muscle 14 made of PC steel and spiral muscle 15 made of the same material,
A support bar 16 for holding a spiral bar made of ordinary rebar and both end plates 12a and 12b.
Both ends penetrate the both end plates 12a, 12b and are screwed to the tension support metal fittings 17a, 17b. One tension support metal fitting 17a is supported by abutting against the end of the mold 10, and the other tension support metal fitting 17b is inserted into the frame 10 and supported by the fixing plate 19 via the pull rod 18. The fixing plate 19 is in contact with the end surface of the mold 10. Then, by tensioning the tension rod 18 with the jack 20, the tension muscle 14 is tensioned and at the same time the support muscle 16 is tensioned.
Is stretched in a straight line so that the spiral muscle 15 is positioned at a predetermined position in the mold.

Further, after a constant tension is applied, the nut 19a is rotated to move the fixing plate 19 so that the fixing plate 19 is brought into contact with the end face of the form, so that the tension is maintained even if the jack is removed.

The apparatus shown in FIGS. 2 and 3 is used for assembling the basket thus buried in the PC pile. This device includes a cylindrical guide tube 22 supported in a cantilevered manner on a fixed support base 21, a perforated guide plate 23 fixed to the rear end side of the guide tube 22, a support bar 16 and a tension bar 14. It is composed of a pull-out device 24 for pulling out in the longitudinal direction, and a fixing device 25 for fixing the wound spiral bar 15 to the support bar 16.

As shown in FIG. 4, the guide cylinder 22 has a guide groove 22 in which a support bar is fitted on the outer peripheral surface in the axial direction.
a, 22a ... are formed in the required number, and
The rear end side end plate 12b is detachably screwed to the front end surface.

The pull-out device 24 is composed of a pulling carriage 31 which moves on the guide rail 30 and a pulling rope 32 which is wound by a winch for moving the pulling carriage 31.

The fixing device 25 is provided with a circular guide 34 arranged on the outer peripheral side of the supporting bars 16 and 16 on a moving table 33 which moves in the longitudinal direction of the supporting bar 16 which is drawn out in a cylindrical arrangement. It is composed of a binding machine 35 supported so as to be movable in the circumferential direction along the.

Next, the work of assembling the basket using the apparatus thus constructed will be described.

First, a spiral bar 15 formed in advance in the form of a coil spring with a small pitch is fitted and supported on the outer periphery of the guide cylinder 22, and a rear end side end plate 12b is attached to the tip of the guide cylinder 22 and also the carriage 31. The front end side end plates 12a are fixed to the rear surfaces of the muscle fixing fittings 31a, respectively.

As shown in FIG. 5, the both end plates 12a and 12b are formed in a donut shape having an opening in the central portion, and supporting muscle insertion holes 38, 38 ... Are formed in the outer peripheral portion, and the center side thereof. The strainer insertion holes 39, 39 ... Are opened in a circular arrangement.

In this state, the tension muscles 14, 14 ... And the support muscles 16, 16 ... Are passed through the predetermined guide holes of the perforated guide plate 23 so that the tension muscles 14 are located inside the guide cylinder 22 on the rear end side end plate. 12b, the tip is passed through the tip side end plate 12a, and the nut 14a is screwed to prevent the nut 14a from coming off. Also support 16
Is passed through the guide groove 22a on the outer circumference of the guide cylinder 22 through the rear end side end plate 12b, the front end thereof is passed through the front end side end plate 12a, and a nut 16a is screwed to prevent the nut from falling off.

Then, the distal end side of the spiral muscle 15 is tied to a desired position of one of the supporting muscles 16 with a wire and temporarily fixed, the carriage 31 is moved, and the tense muscles 14 and the supporting muscles 16 are pulled out.

As a result, the lines 14 and 16 are guided by the perforated guide plate 23 and both end plates 12a and 12b and pulled out in a predetermined arrangement. When the rear end of the spiral muscle 15 is pulled out to the front end portion of the guide cylinder 22, the rear end is temporarily fixed to the guide cylinder 22 and the respective muscles 14, 16 are further pulled out. As a result, the spiral bar 15 is extended in the axial direction and wound around the outer circumference of the support bar 16, 16. At this time, the tension muscles expand at the same pitch as the pitch distribution at the time of manufacturing due to their elasticity.

In this way, the muscles 14, 14
16 is pulled out to near the rear end of the spiral muscle 15, the rear end of the spiral muscle 15 is temporarily fixed to the support muscle 16, and the temporary fixation to the guide cylinder 22 is released to further pull out the tension muscle 14 and the support muscle 1.
The nuts 14b and 16b at the rear end of 6 are brought into contact with the end plate 12b on the rear end side to bring the respective muscles 14 and 16 into a tensioned state, and the muscles are stopped in this state, and the fixing device 25 is sequentially operated to rotate the helical muscle
The crossing position between the support bar 16 and the support bar 16 is fixed by the binding machine 35.

After this fixing work is completed, the front and rear end side end plates 12a and 12b are removed from the carriage 31 and the guide cylinder 22, and the assembly of the basket is completed.

In the above embodiment, a single spiral muscle is wound over the entire length, but a plurality of spiral muscle bundles may be wound continuously in the axial direction or partially overlapped with each other. You may use PC steel wire for a crotch support bar. Further, in order to prevent the supporting bar from coming off, a nut may be used, or a head part may be formed by a heading process.

[0024]

As described above, in the present invention, when the spiral bar is supported by the supporting bar and assembled into a cylindrical cage, end plates are arranged at both ends of the spiral bar, and the tension bar is passed through the end plate to make the cylindrical cage. By assembling the tendon muscle into it at the same time as assembling, it is not necessary to insert the tendon muscle later, and since both ends of the tendon muscle are penetrated by the end plates, This makes it possible to easily perform end selection and fixing work for tension.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a PC pile manufacturing process using a reinforcing bar assembled by the method of the present invention.

FIG. 2 is a sectional view of an example of an apparatus for carrying out the method of the present invention.

FIG. 3 is a sectional view of the same operating state.

FIG. 4 is a cross-sectional view of a guide cylinder.

FIG. 5 is a front view of an end plate used in the method of the present invention.

FIG. 6 is a cut end view of an example of a reinforcing bar assembled by the method of the present invention.

FIG. 7 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

 10 Molding Form 11 Concrete 12a, 12b End Plate 13 Hakama Metal Fitting 14 Tensile Muscle 14a, 14b, 16a, 16b, 19a Nut 15 Helical Muscle 16 Support Muscle 17 Tension Support Metal Fitting 18 Tensile Rod 19 Fixing Plate 21 Fixing Base 22 Guide Tube 22a Guide groove 23 Guide plate 24 Drawer device 25 Fixing device 30 Guide rail 31 Tension trolley 31a Muscle fixing metal fitting 32 Tension rope 33 Moving table 34 Guide 35 Bundling machine 38 Support muscle insertion hole 39 Tensile muscle insertion hole

Claims (1)

(57) [Claims] 1. A circular arrangement has a supporting-muscle insertion hole for penetrating a supporting muscle for supporting a spiral muscle, and a tension muscle made of PC steel penetrates concentrically on the center side of the circular arrangement of the supporting-muscle insertion hole. Using a pair of front and rear end plates having a strainer insertion hole, the rear end plate of the both end plates is fixed to the fixed base side, and the front end plate is fixed to the drawer side. , With the both end plates being brought close to each other, the supporting muscles and the tension muscles are inserted into the respective holes of the rear end side end plate, and the leading ends thereof are passed through the front end side end plate to prevent the same from passing through the both end plates. A coil spring-shaped spiral bar is fitted on the outer peripheral side of the support bar, and then the front end side end plate is moved by the drawer device in a direction away from the fixed base, and the spiral bar is extended in the axial direction for support. With the state that it is wound around the outer peripheral side of the muscle at the desired pitch A method of assembling a basket for a high-bending toughness PC pile, characterized in that the spiral muscle and the supporting muscle are fixed after the completion.